Cited by 91Epigenetics and DNA MethylationFolate and B Vitamins ResearchImmune Response and Inflammation

S-adenosylmethionine mediates inhibition of inflammatory response and changes in DNA methylation in human macrophages

Pfalzer, Anna C., Choi, Sang-Woon, Tammen, Stephanie A., Park, Lara K., Bottiglieri, Teodoro, Parnell, Laurence D., Lamon-Fava, Stefania·2014·Physiological Genomics

Abstract

S-adenosylmethionine (SAM), the unique methyl donor in DNA methylation, has been shown to lower lipopolysaccharide (LPS)-induced expression of the proinflammatory cytokine TNF-α and increase the expression of the anti-inflammatory cytokine IL-10 in macrophages. The aim of this study was to assess whether epigenetic mechanisms mediate the anti-inflammatory effects of SAM. Human monocytic THP1 cells were differentiated into macrophages and treated with 0, 500, or 1,000 μmol/l SAM for 24 h, followed by stimulation with LPS. TNFα and IL-10 expression levels were measured by real-time PCR, cellular concentrations of SAM and S-adenosylhomocysteine (SAH), a metabolite of SAM, were measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS), and DNA methylation was measured with LC-MS/MS and microarrays. Relative to control (0 μmol/l SAM), treatment with 500 μmol/l SAM caused a significant decrease in TNF-α expression (−45%, P < 0.05) and increase in IL-10 expression (+77%, P < 0.05). Treatment with 1,000 μmol/l SAM yielded no significant additional benefits. Relative to control, 500 μmol/l SAM increased cellular SAM concentrations twofold without changes in SAH, and 1,000 μmol/l SAM increased cellular SAM sixfold and SAH fourfold. Global DNA methylation increased 7% with 500 μmol/l SAM compared with control. Following treatment with 500 μmol/l SAM, DNA methylation microarray analysis identified 765 differentially methylated regions associated with 918 genes. Pathway analysis of these genes identified a biological network associated with cardiovascular disease, including a subset of genes that were differentially hypomethylated and whose expression levels were altered by SAM. Our data indicate that SAM modulates the expression of inflammatory genes in association with changes in specific gene promoter DNA methylation.

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Crossref · 10.1152/physiolgenomics.00056.2014

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Authors
Pfalzer, A. C., Choi, S.-W., Tammen, S. A., Park, L. K., Bottiglieri, T., Parnell, L. D., & Lamon-Fava, S.
Affiliations
  • Tufts University (US)
  • Baylor Research Institute, Dallas, Texas
  • Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts; and
Venue
Physiological Genomics
Published
2014-09-01
Volume
46
Issue
17
Pages
617-623
ISSN
  • 1094-8341 (ISSN-L)
  • 1531-2267
OpenAlex
W2003829093
Cited by
90
References
48
Citations by year
2026: 5 · 2025: 6 · 2024: 11 · 2023: 10 · 2022: 7 · 2021: 10 · 2020: 7 · 2019: 7 · 2018: 11 · 2017: 6 · 2016: 6 · 2015: 4
FWCI
2.19
Type
journal article
Language
en
Open access
closed
Locations
  • Physiological Genomics (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Agriculture
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Health Sciences › Medicine › Rheumatology › Folate and B Vitamins Research
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
S-adenosylmethionine, DNA methylation, macrophages, lipopolysaccharide, TNF-α, IL-10, S-adenosylhomocysteine, epigenetic regulation, inflammation, differentially methylated regions, cardiovascular disease genes, THP-1 cells
MeSH terms
Cardiovascular Diseases, Cell Line, Gene Expression Regulation, Humans, Inflammation, Macrophages, S-Adenosylhomocysteine, S-Adenosylmethionine, Tumor Necrosis Factor-alpha, Interleukin-10, DNA Methylation, Gene Regulatory Networks

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